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powerpc/64s/radix: Fix 128TB-512TB virtual address boundary case allocation

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Radix VA space allocations test addresses against mm->task_size which
is 512TB, even in cases where the intention is to limit allocation to
below 128TB.

This results in mmap with a hint address below 128TB but address +
length above 128TB succeeding when it should fail (as hash does after
the previous patch).

Set the high address limit to be considered up front, and base
subsequent allocation checks on that consistently.

Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-11-10 04:27:39 +11:00 committed by Michael Ellerman
parent 35602f82d0
commit 85e3f1adcb
2 changed files with 50 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/powerpc/mm/hugetlbpage-radix.c
View File

@ -48,17 +48,28 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct hstate *h = hstate_file(file);
int fixed = (flags & MAP_FIXED);
unsigned long high_limit;
struct vm_unmapped_area_info info;
if (unlikely(addr > mm->context.addr_limit && addr < TASK_SIZE))
mm->context.addr_limit = TASK_SIZE;
high_limit = DEFAULT_MAP_WINDOW;
if (addr >= high_limit || (fixed && (addr + len > high_limit)))
high_limit = TASK_SIZE;
if (len & ~huge_page_mask(h))
return -EINVAL;
if (len > mm->task_size)
if (len > high_limit)
return -ENOMEM;
if (fixed) {
if (addr > high_limit - len)
return -ENOMEM;
}
if (flags & MAP_FIXED) {
if (unlikely(addr > mm->context.addr_limit &&
mm->context.addr_limit != TASK_SIZE))
mm->context.addr_limit = TASK_SIZE;
if (fixed) {
if (prepare_hugepage_range(file, addr, len))
return -EINVAL;
return addr;
@ -67,7 +78,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
if (addr) {
addr = ALIGN(addr, huge_page_size(h));
vma = find_vma(mm, addr);
if (mm->task_size - len >= addr &&
if (high_limit - len >= addr &&
(!vma || addr + len <= vm_start_gap(vma)))
return addr;
}
@ -78,12 +89,9 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.length = len;
info.low_limit = PAGE_SIZE;
info.high_limit = current->mm->mmap_base;
info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
info.align_mask = PAGE_MASK & ~huge_page_mask(h);
info.align_offset = 0;
if (addr > DEFAULT_MAP_WINDOW)
info.high_limit += mm->context.addr_limit - DEFAULT_MAP_WINDOW;
return vm_unmapped_area(&info);
}

55
arch/powerpc/mm/mmap.c
View File

@ -106,22 +106,32 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr,
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int fixed = (flags & MAP_FIXED);
unsigned long high_limit;
struct vm_unmapped_area_info info;
high_limit = DEFAULT_MAP_WINDOW;
if (addr >= high_limit || (fixed && (addr + len > high_limit)))
high_limit = TASK_SIZE;
if (len > high_limit)
return -ENOMEM;
if (fixed) {
if (addr > high_limit - len)
return -ENOMEM;
}
if (unlikely(addr > mm->context.addr_limit &&
mm->context.addr_limit != TASK_SIZE))
mm->context.addr_limit = TASK_SIZE;
if (len > mm->task_size - mmap_min_addr)
return -ENOMEM;
if (flags & MAP_FIXED)
if (fixed)
return addr;
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
if (mm->task_size - len >= addr && addr >= mmap_min_addr &&
if (high_limit - len >= addr && addr >= mmap_min_addr &&
(!vma || addr + len <= vm_start_gap(vma)))
return addr;
}
@ -129,13 +139,9 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.flags = 0;
info.length = len;
info.low_limit = mm->mmap_base;
info.high_limit = high_limit;
info.align_mask = 0;
if (unlikely(addr > DEFAULT_MAP_WINDOW))
info.high_limit = mm->context.addr_limit;
else
info.high_limit = DEFAULT_MAP_WINDOW;
return vm_unmapped_area(&info);
}
@ -149,37 +155,42 @@ radix__arch_get_unmapped_area_topdown(struct file *filp,
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
unsigned long addr = addr0;
int fixed = (flags & MAP_FIXED);
unsigned long high_limit;
struct vm_unmapped_area_info info;
high_limit = DEFAULT_MAP_WINDOW;
if (addr >= high_limit || (fixed && (addr + len > high_limit)))
high_limit = TASK_SIZE;
if (len > high_limit)
return -ENOMEM;
if (fixed) {
if (addr > high_limit - len)
return -ENOMEM;
}
if (unlikely(addr > mm->context.addr_limit &&
mm->context.addr_limit != TASK_SIZE))
mm->context.addr_limit = TASK_SIZE;
/* requested length too big for entire address space */
if (len > mm->task_size - mmap_min_addr)
return -ENOMEM;
if (flags & MAP_FIXED)
if (fixed)
return addr;
/* requesting a specific address */
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
if (mm->task_size - len >= addr && addr >= mmap_min_addr &&
(!vma || addr + len <= vm_start_gap(vma)))
if (high_limit - len >= addr && addr >= mmap_min_addr &&
(!vma || addr + len <= vm_start_gap(vma)))
return addr;
}
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.length = len;
info.low_limit = max(PAGE_SIZE, mmap_min_addr);
info.high_limit = mm->mmap_base;
info.high_limit = mm->mmap_base + (high_limit - DEFAULT_MAP_WINDOW);
info.align_mask = 0;
if (addr > DEFAULT_MAP_WINDOW)
info.high_limit += mm->context.addr_limit - DEFAULT_MAP_WINDOW;
addr = vm_unmapped_area(&info);
if (!(addr & ~PAGE_MASK))
return addr;